Hypodermic syringe



ec. 28, 1948. M. L. LocKHART i 2,457,313

HYPODERMIC SYRINGE Filed March 5, 1945 INVENTOR.

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Patented Dec. 28, 1948 lfJNlfrl-zDI STA-TES PATENT OFFICE HYeoDnRMIC. SYRINGE Marshall L. Lockhart, Rutherford, N. J: r Application` Marchi5, 1945,; Serial No. :580,988 6. claims. (ci. 12s-22o) y This: invention@ relates to functionally and structurally. improvedy hypodermic syringes: and hasparticular referenceto icertainnew and useful improvements in` syringes of" the type shown in myprior vcopending .application 'SerialfNo 656,737, ill'edfGctober- 2; 1944;.

It is. an. object off' the` invention. to furnish a unit ofthisv type `and by means. ofv which: relativelyf minutel doses of medicament mayl be dispensed* byfthe operator or physiciany with assurlance-that an accurate dosage will result:

A further object-isthatlo furnishing-an assem- 'blywhich will include'both a syringe proper as .wellies an ampn'le;x both of these units embodying functionally fand structurally improved'` characteristics and;` when combined, cooperating inan extremely-eili'cient and desirable mannen? Still another objectyisV that'of' furnishing; an apparatusofrths type which will" embody relatively-few; parts of relatively simplex andarugged design,l such parts `lzieingcapable of quantity manufacture to furnish --units which mayv `be,` sold for relatively nominal figures Moreover,` the assem- `bly/will vbe' off such a simple `nature that'a-'rela- 'tively'unskilledpersonv will have no difficulty. in either grouping the partsv or, `when so grouped or assembled; will be readily capableofoperating the unit with completeA controlfover thev resultant l :dosage-or injection.

Withthese and-other objects in'mind, reference islhad to theattachedsheet -of drawings: illustratingf practical embodiments of`- the inventiom rand inwhich:

Fig; =1 is -av plan viewIof ans assembly;

Fig. '2-"is aside elevati-on` thereof;

Fig; 3V isa longitudinal sectional View taken along` the lines 3--3 inthe direction Aoi the" arrows asrindica-ted inl Fig; 1;

Figsl is'a transverse sectional Iview taken1along s .the lines-I-l vand 'in the idirection oil the .arrows as indicated in 3; and

Fig, 51 is al side elevation of an ampulefelement embodyinga structure different from that'ioffthe mptule vShown incertain 'of thee-preceding views;

the embodiment` oftl'ie invention" *selected for purposes of'illustration, a'hypodermic syringe comprises a .holder I0.. a `double-endedhollow needle I2, an ampule'l', anda propelling means inftheform.sofia can |76,

The holder, as illustrated in:Fig s.v..1f4;"maylbe provided byy a hollow metal tubular member open at itszf-back 'endsoas `'to telescopically -or vslidaloly receiverthe ampule I 4. Thefforward endpofl the 'holderj Iilgf comprises a `pair of-springarnislyl8 spac'dgandi formed as jaws 2Ilso` as tot receive nndlciampv therebetween. the 'shank ofg the double-"enedhollow needle i2; The needlet2 mrbegmssriedinrlremoved from the nad-s tu when the ampule I4 is withdrawn suicientlyv from the holder I0 so asy to clear the inner end 2.4 of the needle.

The jawsZU removably clampvthe needle in the position as illustrated relative to the holder and position the inner end 24 ofthe needle so that upon telescopingrmovement of the ampule I4 relative to the holder I0; the stopper 26 closing the medicament containing boreY 300tthe ampule IIIv will be puncturedysoasto establish communication between the interiorof the needle and the medicament'fcontaining bore of the ampule I4. The'hold'er yI0 furtherincludes a pair of 'rear-v wardlyfacing abutmentsv 28 which are positioned. inA thespath of'the stopper 2'65` upon telescoping movement of the ampule AIllrelativeto the holder I0` so as to engage suoliX stopper 2`6f and cause the sametomove relativeto the ampule I4" and inwardlyinthe medicament containing bore Sill thereof tofunction as-a= piston for` expressing medicament from such Ibore 30through^theneedle f2`ancl from the-projecting end' 32'- thereof.

Y The' holder lio-may include wings 3-4 to facilitate holding the same. Propelling means in the form of 'a cap I 6 is yprovided' for radvancing the ampule Minto the vholder IU, andthis cap IB may comprise a hollowl tubular-member :externally threadedat the open` end 3B I'thereof for 4cooperation with the internal Ithreads:3l3fprovidedzin the hollow ampule` receivingspace. of thekholder I0. The endlliof the' cap i6 may be knurled.

' bylthreadingthe capu IE into the holder I il, 'the ampule lllrwill Ideaclvanced'into the holderandmedicament will'be displaced from; the bore 30' oitheI ampule I41fromthe1projecting end 32 offithe-needl'e.'

*Fromthe foregoingitawill fbe appreciated there-l fore that by a predetermined amount of rotation ofthe cap IE relative: to the holder Ill,v predeterminedminute 4amounts :of medicament may be expelled from the projecting end31lofV the `needle into y-thetissue `tobetreatecl. This' is i extremely important@ in many types of hypodermic injections `where.onlyua drop or tWoof the medicamentris 'required for-the .particular` treatment. Thetampulebirman-comprise a hollow tubular Ymember formed4 o a suitable plastic or .other material having'a partition 4.2 intermediate the endsfthereofl for-:dividing the bore of the ampule into twoseparate compartments` In this manner,y after the medicamentfrom one compartment isused, the ampule Ilmay be Withdrawn and the yoth-er end,` which sidentica'l, .may be inserted in the. holder.

`.lnwlig zatmodifled formofthe invention is illustrated in which the ampule H4, similar to that previously Idescribed, is provided with an f'adernally,` threaded portion |16 at the centeriorholder for expelling medicament from the pro.

jecting end 32 of the needle. The ampule illustrated in Fig. 5, like that illustrated in the aforesaid embodiment, may be formed of a suitable plastic material. y

While I have illustrated and described a preferred embodiment of my invention, it is understood that this is capable of modification and I therefore do not wish to be limited'to the precise details set forth but desire to avail myself of such changes and alterations which fall with` in the purview of the following claims.

I claim: i l

1. In a hypodermic syringe, in combination, a tubular body formed with an unobstructed rear opening,` screw threads extending on the inner face of said body and adjacent said opening; a double ended needle mounted by the forward end of said body with the outer end of said needle extending beyond said body and its inner ,end

extending within said Abody to a point short of a, the rear opening thereof, a thrust portion forrn`` ing a part of said body and projecting from the forward end of the same, adjacent saidneedle and terminating at a .pointy short of the inner needle end, an ampule comprising a body having one of its ends closed, its opposite end being open, apstopperforsealing such opposite end, such end of 4the ampule having a diameterless than the screw vthreads .of said body whereby said ampule may be introduced through the rear opening of said body and be directly projected to a point at which the .outer face of the stopper' is engaged by the end of the thrust portion and the inner end of -the needle penetratesv said stopper and means thereupon engageable with the threads of said body for advancing said ampule within said body to telescopically enclose said thrust portion to `effect a retraction of the stopper within the ampule.

2. In a hypodermic syringe,` in combination, a

tubular body formed with an unobstructed rear opening, screw threads extending on the inner face of said bodyandadjacent said opening, a double ended needle mounted by; .the forward end of said body with the outer end of said needle extending beyond said body and its kinner end extending within saidbody toa point` short of the rear opening'thereof, a thrust portion forming a part of said body and projecting from the forward end ofthe same, adjacent said needle and -terminating at a point short of the inner needle end," an ampule comprising a body having one of its ends closed, its opposite end being open, a stopper for sealing suchy opposite end,

suchend of the ampule having a'diameter vless than the screw threads of said. body whereby said ampule may be introduced through the rear opening of said'body and be directly projected to a point at which the outer face of thestopper is engaged by the end of the thrust'portion and the inner end of the needle'penetrates ,said stopper and threads forming a part of said ampule and disposed adjacent its closed end, such ampule threads being cooperable with the threads a'dja'- cent the opening of said tubularr Y ampule has been disposed Vtherein to cause a projection of the ampule within saidl body to telescope the'same'over said thrust poitiulld,

body after the ward 'end'of the same, adjacent said needle and terminating at a `point short of the inner needle end, an ampule comprising a bodyhaving one of its' ends closed, its opposite end being open, a stopper for sealing such opposite end, such end of the ampule having a diameter'less thanfthe screw threads of said body whereby said-ampule may be introduced through the rear=zopening;of said body and be directlyprojected to, a point at' which the outer face of the stopper is engaged by the end of the thrust portion' and the'inner end of the needle penetrates said stopper and a cap to receive said ampule and said cap hav-ing its exterior facewthreaded to cooperate withf the threads of said body to cause the ampule to telescope over said thrust portion and to cause the ampule stopper to be retracted.

4. As an article of manufacture, an ampule comprising a tubular body,vanvendfrwall permanently closing one end of the same, the opposite end of said bodyvbeing open and screw threads of a diameter larger than said body and disposed adjacent the closed end of the same,

A5. As an article of manufacturesanV ampule comprising aftubular body, ya wall disposed substantiallybetween the opposite ends of said body and providing a permanent partition sealing said opposite ends from each other and screwgthreads encirclingsaid body substantially in the zone of said partition and having adiameter greater than the diameter offsaid body. 1 v '6. In a hypodermic syringe, in combinationya tubularbody formed With-an unobstructed rear opening, screw threads extending on the inner face of said body and adjacent said opening, a double ended needle mounted by the forward end opsaidvbody with the outer end 4of said needle extending beyond said body and itsvinner end extending within said body to a point short of the rear opening thereof,a thrust portion forming a part ofv said-body and projecting from the forward end of the same, adjacent said needle and terminating at a point short of the inner needle end and said body being adapted to have a stoppcred ampule introducedthrough its rear opening, the stopper thereof being penetrated by the inner needle end and engaged by said thrust portion; the said screw threads coacting with other` threadsjto move the ampule intelescopi relationship with respect to said tlirufstportion.

L. IQCKHART.

MARSHALL UNrrED STATES VPATENTS.; f i Date 

